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杜老师怎么用 txt 写题面，这么敷衍？
diyiti.cpp/c/pas diyiti.in diyiti.out 256MB 2s 给定一个1到n的排列，P_1,P_2,...,P_n，对所有三元组(i,j,k)求P_i*P_j*P_k的和，其中1<=i,j,k<=n,(i,j)=(j,k)=(k,i)=1。 答案对2^30取模。 input 第一行一个正整数n。 接下来一行n个正整数P_1,P_2,...,P_n。 output 输出答案。 sample in 5 3 4 2 5 1 sample out 981 20%, n<=100 40%, n<=2000 100%, n<=10^5 其中10%点, n=10^5,P_i=i
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